Set archive_groupchats to false by default

[arcusfelis]

Proposed changes include:

• Set archive_groupchats to false by default

modules.mod_mam_meta.pm.archive_groupchats

• Syntax: boolean
• Default: false (yes, now)
• Example: modules.mod_mam_meta.pm.archive_groupchats = true

[codecov]

Codecov Report

Merging #3082 (be8eade) into master (f166757) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #3082      +/-   ##
==========================================
- Coverage   78.84%   78.83%   -0.01%     
==========================================
  Files         380      380              
  Lines       31227    31227              
==========================================
- Hits        24620    24619       -1     
- Misses       6607     6608       +1     

Impacted Files	Coverage Δ
src/mam/mod_mam.erl	89.25% <100.00%> (ø)
...c/global_distrib/mod_global_distrib_server_mgr.erl	75.14% <0.00%> (-2.26%)	⬇️
...bal_distrib/mod_global_distrib_hosts_refresher.erl	71.69% <0.00%> (-1.89%)	⬇️
src/mod_muc_room.erl	77.50% <0.00%> (-0.06%)	⬇️
src/mod_muc_log.erl	77.72% <0.00%> (ø)
src/pubsub/mod_pubsub_db_mnesia.erl	92.82% <0.00%> (+0.42%)	⬆️
src/ejabberd_sm.erl	76.52% <0.00%> (+0.60%)	⬆️
src/ejabberd.erl	55.00% <0.00%> (+10.00%)	⬆️

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[DenysGonchar]

looks good